#include <iostream>
using std::cout;
using std::endl;

class Test
{
public:
    static int * _a;
};
int* Test::_a;


void test0(){
    /* Test tt; */
    /* cout << tt._a << endl; */

    /* cout << Test::_a << endl; */
    if(Test::_a == nullptr){
        cout << "hello" << endl;
    }
}

int main(void){
    test0();
    return 0;
}
